source3/lib/messages_ctdbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba internal messaging functions
   4    Copyright (C) 2007 by Volker Lendecke
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "messages.h"
  22 #include "util_tdb.h"
  23
  24 #ifdef CLUSTER_SUPPORT
  25
  26 #include "ctdb.h"
  27 #include "ctdb_private.h"
  28 #include "ctdbd_conn.h"
  29
  30
  31 struct messaging_ctdbd_context {
  32         struct ctdbd_connection *conn;
  33 };
  34
  35 /*
  36  * This is a Samba3 hack/optimization. Routines like process_exists need to
  37  * talk to ctdbd, and they don't get handed a messaging context.
  38  */
  39 static struct ctdbd_connection *global_ctdbd_connection;
  40 static int global_ctdb_connection_pid;
  41
  42 struct ctdbd_connection *messaging_ctdbd_connection(void)
  43 {
  44         if (global_ctdb_connection_pid == 0 &&
  45             global_ctdbd_connection == NULL) {
  46                 struct event_context *ev;
  47                 struct messaging_context *msg;
  48
  49                 ev = event_context_init(NULL);
  50                 if (!ev) {
  51                         DEBUG(0,("event_context_init failed\n"));
  52                 }
  53
  54                 msg = messaging_init(NULL, procid_self(), ev);
  55                 if (!msg) {
  56                         DEBUG(0,("messaging_init failed\n"));
  57                         return NULL;
  58                 }
  59         }
  60
  61         if (global_ctdb_connection_pid != getpid()) {
  62                 DEBUG(0,("messaging_ctdbd_connection():"
  63                          "valid for pid[%d] but it's [%d]\n",
  64                          global_ctdb_connection_pid, getpid()));
  65                 smb_panic("messaging_ctdbd_connection() invalid process\n");
  66         }
  67
  68         return global_ctdbd_connection;
  69 }
  70
  71 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  72                                     struct server_id pid, int msg_type,
  73                                     const DATA_BLOB *data,
  74                                     struct messaging_backend *backend)
  75 {
  76         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  77                 backend->private_data, struct messaging_ctdbd_context);
  78
  79         struct messaging_rec msg;
  80
  81         msg.msg_version = MESSAGE_VERSION;
  82         msg.msg_type    = msg_type;
  83         msg.dest        = pid;
  84         msg.src         = msg_ctx->id;
  85         msg.buf         = *data;
  86
  87         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  88 }
  89
  90 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  91 {
  92         /*
  93          * The global connection just went away
  94          */
  95         global_ctdb_connection_pid = 0;
  96         global_ctdbd_connection = NULL;
  97         return 0;
  98 }
  99
 100 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 101                               TALLOC_CTX *mem_ctx,
 102                               struct messaging_backend **presult)
 103 {
 104         struct messaging_backend *result;
 105         struct messaging_ctdbd_context *ctx;
 106         NTSTATUS status;
 107
 108         if (!(result = talloc(mem_ctx, struct messaging_backend))) {
 109                 DEBUG(0, ("talloc failed\n"));
 110                 return NT_STATUS_NO_MEMORY;
 111         }
 112
 113         if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
 114                 DEBUG(0, ("talloc failed\n"));
 115                 TALLOC_FREE(result);
 116                 return NT_STATUS_NO_MEMORY;
 117         }
 118
 119         status = ctdbd_messaging_connection(ctx, &ctx->conn);
 120
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
 123                            nt_errstr(status)));
 124                 TALLOC_FREE(result);
 125                 return status;
 126         }
 127
 128         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 129
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 132                            nt_errstr(status)));
 133                 TALLOC_FREE(result);
 134                 return status;
 135         }
 136
 137         global_ctdb_connection_pid = getpid();
 138         global_ctdbd_connection = ctx->conn;
 139         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 140
 141         set_my_vnn(ctdbd_vnn(ctx->conn));
 142
 143         result->send_fn = messaging_ctdb_send;
 144         result->private_data = (void *)ctx;
 145
 146         *presult = result;
 147         return NT_STATUS_OK;
 148 }
 149
 150 #else
 151
 152 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 153                               TALLOC_CTX *mem_ctx,
 154                               struct messaging_backend **presult)
 155 {
 156         return NT_STATUS_NOT_IMPLEMENTED;
 157 }
 158
 159 #endif